GEOS 306 Midterm: GEOS 306 University of Arizona Midterm 1 2004
31 Jan 2019
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1: (7 pts) list the 3 most common isotopes of carbon, indicating the number of protons and neutrons for each. Make spin diagrams for both of these valence states. 3: (15 pts) derive the radius-ratio rule parameter (rc/ra = . 225) for a 4- coordinated cation. Draw a picture and carefully label everything so that your answer can be evaluated properly. 4: (20 pts) enumerate the 7 types of bonding, with a short description and an example of each. 5: a) (10 pts) suppose the illustrated figures represent closest-packed arrangements of anions. Identify the different locations where cations could be coordinated with 2, 3, 4, 6, or 12 anions. In the position of the cation, write its coordination number: (10 pts) label the packing type for each of the following diagrams. 6: (20 pts) corundum, al2o3, is an important rock-forming mineral whose gem varieties include ruby and sapphire.
